Enter the pressure (psi) at the nozzle
(between 45 psi and 100 psi): (Either enter the average dynamic pressure for the rotor on
one zone or enter the average dynamic pressure for all the
rotors on the entire system. If the dynamic pressure is not
available, enter the system's static pressure. The static
pressure will overstate the water savings, but it will still
provide an estimate of the potential water savings.)

Step 2:

Enter
the GPM @ 45 psi: (If you entered the pressure for one zone above, enter the
GPM for that zone. If you entered the pressure for the entire
system above, enter the GPM for the entire system).

Step 3:

Enter
Average Watering Time per Day (min.):

Step 4:

Enter
Average Number of Watering Days per Week:

Step 5:

Enter
Average Watering Weeks per Year:

The initial system waste
is:

GPM

The yearly water savings
is*:

gallons

* (Due to varying conditions, your actual cost savings may be different.
This formula is designed solely as a basis for estimating potential
savings.)